#include "Thread.h"
#include "CurrentThread.h"

#include<semaphore.h>

std::atomic_int Thread::numCreated_(0);

Thread::Thread(ThreadFunc func, const std::string &name)
    : started_(false)
    , joined_(false)
    , tid_(0)
    , func_(std::move(func))
    , name_(name)
{
    setDefaultName();
}
Thread::~Thread()
{
    if(started_ && !joined_)
    {
        thread_->detach(); //thread类的接口，设置分离线程
    }
}

void Thread::start()
{
    started_ = true;
    sem_t sem;
    sem_init(&sem, false, 0);
    //开启线程
    thread_ = std::shared_ptr<std::thread>(new std::thread([&](){
        //获取线程tid
        tid_ = CurrentThread::tid();
        sem_post(&sem);
        //开启线程执行此函数
        func_();
    }));
    //等待新线程的tid值确定后,保证可以访问线程的tid_
    sem_wait(&sem);
}
void Thread::join()
{
    joined_ = true;
    thread_->join();
}

void Thread::setDefaultName()
{
    int num = ++numCreated_;
    if(name_.empty())
    {
        char buf[32] = {0};
        snprintf(buf, sizeof buf, "Thread%d", num);
        name_ = buf;
    }
}